Arca Caldaie ASPIRO DUO TECH Owner's manual

A
AS SP PI IR RO O
D
DU UO O T TE EC CH H
Installation
Operation
Maintenance
www.arcacaldaie.com

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3
ARCA s.r.l. will have no liability for any printing or translation mistake. The manufacturer has the right to
modify its products if such modifications would be necessary or useful, without affecting the basic
characteristics of the product.
The present documentation is also available in PDF format. To get it, please contact ARCA s.r.l.
technical department.
code: MAN1004DUO
pages: 63
issue: 1st EDITION
revision: 2009, june

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INDEX
1. GENERAL PRESCRIPTIONS.....................................................................................................................6
2. TECHNICAL CHARACTERISTICS AND OVERALL DIMENSIONS ............................................................7
2.1. BOILER ...................................................................................................................................................................7
2.2. ARCHIMEDEAN SCREW .......................................................................................................................................8
2.3. FUEL TANK ............................................................................................................................................................8
3. MAIN BOILER COMPONENTS...................................................................................................................9
3.1. WOOD CHARGING BOX........................................................................................................................................9
3.2. MAIN BURNER REFRACTORY CEMENT FRAME AND CAST IRON BARS......................................................... 9
3.3. HEAT EXCHANGE AREA AND THERMAL CATALYST ELEMENT .......................................................................9
3.4. SMOKE DRAFTING PASS-THROUGH BOX AND FAN .........................................................................................9
3.5. AIR DISTRIBUTION SUBASSEMBLY ....................................................................................................................9
3.6. HOT SANITARY WATER HEAT EXCHANGER....................................................................................................10
3.7. EMERGENCY HEAT EXCHANGER .....................................................................................................................10
3.8. WATER TEMPERATURE SENSORS MOUNTING CASES ................................................................................. 10
3.9. BYPASS PUMP (ANTICONDENSATION) ............................................................................................................10
3.10. INSULATION.........................................................................................................................................................10
3.11. CIRCUIT FILLING WATER ...................................................................................................................................10
3.12. CIRCUIT FILLING WATER ...................................................................................................................................11
4. OPERATION MODES...............................................................................................................................11
4.1. GASIFICATION TECHNOLOGY (WOOD OPERATION) ......................................................................................11
5. INSTALLATION.........................................................................................................................................12
5.1. INSTALLATION IN THE BOILER ROOM..............................................................................................................12
5.2. EXTERNAL BOILER CASE PACKING .................................................................................................................13
5.3. EXTERNAL BOILER CASE MOUNTING ..............................................................................................................13
5.4. SYSTEM EXPANSION..........................................................................................................................................14
5.5. CHIMNEY..............................................................................................................................................................14
5.6. EMERGENCY HEATSINK RELIEF VALVE CONNECTION .................................................................................15
6. ELECTRONIC CONTROL SY 400 (CODE PEL0100DUO) ......................................................................16
6.1. THE DISPLAY.......................................................................................................................................................16
6.2. ELECTRONIC CONTROL BOARD .......................................................................................................................17
6.3. SENSORS CONNECTION....................................................................................................................................18
6.4. SMOKE TEMPERATURE SENSOR CONNECTION ............................................................................................18
6.5. TERMINAL STRIP WIRINGS................................................................................................................................19
7. OPERATION MODES...............................................................................................................................21
7.1. WOOD OPERATION.............................................................................................................................................21
7.1.1. OPERATION CYCLE ................................................................................................................................................................24
7.2. PELLET OPERATION...........................................................................................................................................25
7.2.1. OPERATION CYCLE ................................................................................................................................................................26
8. THE MENUS.............................................................................................................................................27
8.1. BOILER THERMOSTATIC CONTROL MENU ......................................................................................................27
8.2. CUSTOMER MENU ..............................................................................................................................................27
8.3. SYSTEM OPERATION MENU ..............................................................................................................................29
8.4. HEATING SYSTEM OPERATION MENU .............................................................................................................30
8.5. TEMPERATURE SENSORS READING MENU .................................................................................................... 31
8.6. CLOCK MENU.......................................................................................................................................................33
8.7. CRONOTHERMOSTAT MENU.............................................................................................................................33
8.8. MANUAL AUGER ACTIVATION MENU ................................................................................................................40
8.9. TEST MENU..........................................................................................................................................................40
8.10. SUMMER / WINTER MENU..................................................................................................................................43

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9. HYDRAULIC CONNECTION DIAGRAMS.................................................................................................43
9.1. GENERAL CONNECTION DIAGRAMS FOR HEATING ONLY - OPEN EXPANSION TANK............................... 43
9.1.1. GENERAL CONNECTION DIAGRAM FOR HEATING ONLY PURPOSES WITH OPEN EXPANSION TANK .......................44
9.1.2. GENERAL CONNECTION DIAGRAM FOR HEATING ONLY PURPOSES WITH OPEN EXPANSION TANK AND
MIXING VALVE .........................................................................................................................................................................44
9.1.3. GENERAL CONNECTION DIAGRAM FOR HEATING ONLY PURPOSES WITH PLATE TYPE HEAT EXCHANGER..........45
9.1.4. GENERAL CONNECTION DIAGRAM FOR HEATING ONLY PURPOSES WITH CLOSED EXPANSION TANK ON THE
HOT SANITARY WATER CIRCUIT ..........................................................................................................................................45
9.2. GENERAL CONNECTION DIAGRAMS FOR HEATING PURPOSES WITH HOT SANITARY WATER
STORING TANK ...................................................................................................................................................46
9.2.1. GENERAL CONNECTION DIAGRAMS FOR HEATING PURPOSES WITH HOT SANITARY WATER STORING TANK......47
9.2.2. GENERAL CONNECTION DIAGRAM FOR HEATING PURPOSES WITH HOT SANITARY WATER STORING TANK
EQUIPPED WITH DOUBLE COIL TYPE HEAT EXCHANGER AND SOLAR PANELS ...........................................................47
9.2.3. GENERAL CONNECTION DIAGRAM FOR HEATING PURPOSES WITH CLOSED EXPANSION TANK ON THE PLATE
TYPE HEAT EXCHANGER CIRCUIT, WITH HOT SANITARY WATER STORING TANK EQUIPPED WITH DOUBLE
COIL TYPE HEAT EXCHANGER AND SOLAR PANELS.........................................................................................................48
9.2.4. GENERAL CONNECTION DIAGRAM FOR HEATING PURPOSES WITH CLOSED EXPANSION TANK ON THE HEAT
EXCHANGER CIRCUIT, WITH HOT SANITARY WATER STORING TANK EQUIPPED WITH DOUBLE COIL TYPE
HEAT EXCHANGER AND SOLAR PANELS ............................................................................................................................48
9.3. GENERAL CONNECTION DIAGRAMS FOR A SYSTEM WITH "PUFFER" OR PUFFER COMBI EXTERNAL
TANK.....................................................................................................................................................................49
9.3.1. GENERAL CONNECTION DIAGRAM WITH "PUFFER COMBI" TANK AND SOLAR PANELS ..............................................50
9.3.2. GENERAL CONNECTION DIAGRAM FOR HEATING PURPOSES WITH CLOSED EXPANSION TANK ON THE PLATE
TYPE HEAT EXCHANGER CIRCUIT, WITH "PUFFER COMBI" TANK AND SOLAR PANELS ..............................................50
9.4. GENERAL CONNECTION DIAGRAMS FOR HEATING PURPOSES WITH HOT SANITARY WATER
STORING TANK AND "PUFFER" TANK...............................................................................................................51
9.4.1. GENERAL CONNECTION DIAGRAM FOR HEATING PURPOSES WITH "PUFFER" TANK AND HOT SANITARY
WATER STORING TANK EQUIPPED WITH DOUBLE COIL TYPE HEAT EXCHANGER AND SOLAR PANELS .................52
10. “N” ZONES SYSTEMS CONNECTIONS...................................................................................................43
11. MAINTENANCE AND CLEANING ............................................................................................................54
11.1. DAILY CLEANING (WOOD OPERATION)............................................................................................................54
11.2. WEEKLY CLEANING ............................................................................................................................................54
11.3. MONTHLY MAINTENANCE..................................................................................................................................55
11.4. SPECIAL MAINTENANCE ....................................................................................................................................55
12. BOILER PROBLEMS FIXING ...................................................................................................................56
12.1. ELECTRONIC CONTROL SYSTEM PROBLEMS FIXING ...................................................................................56
12.2. BOILER PROBLEMS FIXING (WOOD OPERATION)...........................................................................................57
12.3. BOILER PROBLEMS FIXING (AUTOMATIC BURNER OPERATION) ................................................................. 57
13. GENERAL TECHNICAL TIPS...................................................................................................................58
13.1. SETTINGS AND HIGHEST PERMITTED TEMPERATURES ...............................................................................58
13.2. FIRST FIRING.......................................................................................................................................................58
13.3. REFRACTORY CEMENT PARTS IN THE BOILER .............................................................................................. 58
13.4. BOILER AUTONOMY AND FUEL CHARGING INTERVALS................................................................................58
13.5. EXPLOSIONS .......................................................................................................................................................58
13.6. CONSUMABLE MATERIALS................................................................................................................................59
13.7. WARNINGS ..........................................................................................................................................................61
14. MODEL CHOOSING.................................................................................................................................61
14.1. BOILER POWER...................................................................................................................................................61

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1. GENERAL WARNINGS
The instruction and maintenance manual is an integral part of the product, and it must be the delivered to the
customer along with the product. Read carefully any warning shown in the manual because they provide
important guidelines and details concerning the installation, use and maintenance security. Store the manual
in a safe place for further reference.
The installation must be carried out only by qualified personnel or by an authorized ARCA technical center
following the manufacturer’s recommendations and guidelines.
Be sure that the product comes complete and without any sign of damage. In case of doubt, don't use the
product and call your local supplier. The packing components must be delivered to authorized collecting
centers only and they must not be left in the reach of children.
Before performing any changing or maintenance or cleaning operation on the system, turn off the boiler using
the main external switch.
If the boiler is out of order or shows strange behavior, turn it off immediately avoiding any kind of repairing or
direct action. Coal qualified personnel only; any kind of repairing must be carried out by an authorized
technical center only and it is mandatory the use of original spare parts only.
We take no responsibility for any damage which could result from wrong installation or use or from being not
respected the instructions and recommendations given in this manual.
Not respecting the instructions and guidelines of this manual may compromit the security level of the whole
system or of its components, causing danger for the customer, for which we don't take any responsibility.
WARNING!
The first firing and the final test of the boiler must be performed
by an authorized technical center only.

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2. TECHNICAL CHARACTERISTICS AND OVERALL DIMENSIONS
2.1. Boiler
Key:
1 Electronic control board A1 Heating circuit delivery
2 Top door A2 Heating circuit return
3 Pellet burner A3 Boiler water descharging
4 Primary air stream adjusting (wood operation) A4 Sanitary hot water heat exchanger connections
(only SA ver.)
5 Secondary air stream adjusting (wood operation) A5 Security heat exchanger connections
6 Flame control bull's eye (wood operation) A6 Temperature sensors receptacles (S4)
7 Bottom door A7 Temperature sensor receptacle (S5)
8 Fan motor - two speeds A8 Smoke outlet
9 Anti deflagration door A9 Flue temperature sensor receptacle
Model
Power
rated
minimum
kcal/h
kW
Power
rated
maximum
kcal/h
kW
Power
to the
burner
maximum
kcal/h
kW
Boiler
weight
kg
Boiler
capacity
liters
Insertion
losses
water side
m C.A.
Insertion
losses
smoke
side
mm C.A.
Rated
pressure
bar
Comb.
chamber
volume
litri
Wood box
opening
size
mm
Max wood
logs
length
cm
A 29 DTR/SA
14.000
16
26.000
30
29.500
34 380 95 0,10 0,3 4 95
290 ×330 53
A 34 DTR/SA 20.000
23
25.000
29
29.600
34,5 470 115 0,08 0,4 4 135
340 ×430 53
A 34 DTLA
R/SA
20.000
23
25.000
29
29.600
34,5 555 135 0,10 0,6 4 185
340 ×430 68
A 43 DTR/SA
23.000
27
35.000
41
43.000
50 470 115 0,08 0,4 4 135
340 ×430 53
A 52 DTR/SA
28.000
33
42.000
49
52.000
60 555 135 0,10 0,6 4 185
340 ×430 68
Model A
mm
B
mm
C
mm
D
mm
E
mm
F
mm
G
mm
H
mm
I
mm
A1 A2
ø
A3
ø
A4
ø
A5
ø
A6 A7
ø
A8
ø
A 29
DTR/SA 550 850 1.200 190 260 980 80 1130 230 1”¼ ½” ½” ½” ½” 180
A 34
DTR/SA 650 850 1.300 190 260 1.080 80 1220 230 1”½ ½” ½” ½” ½” 180
A 34
DTLAR/SA 650 1.030 1.300 190 260 1.080 80 1220 230 1”½ ½” ½” ½” ½” 180
A 43
DTR/SA 650 850 1.300 190 260 1.080 80 1220 230 1”½ ½” ½” ½” ½” 180
A 52
DTR/SA 650 1.030 1.300 190 260 1.080 80 1220 230 1”½ ½” ½” ½” ½” 180

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2.2. Archimedean screw (code COC0502)
2.3. Fuel tank (code CON0600)
1694
1920
1
2
2
A
t the first boiler firin
g
, we
recommend to manuall
y
activate
the archimedean screw motordrive
(
LOAD MENU
)
so to have the
whole au
g
er tube filled with fuel
gettin
g
b
y
this wa
y
a constant fuel
feedin
g
rate not to have boile
r
operation problems.
1.
A
rchimedean scre
w
gear motordrive
2. Fuel feeding auger
WARNING:
We recommend to insert the
archimedean screw in the fuel
tank inclined as much as
possible.

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3. MAIN BOILER COMPONENTS
3.1. Wood charging box
This is the boiler
fuel box . In this box, located in the boiler upper part, the wood logs are charged after being
succesfully performed the ignition procedure, getting a first layer of hot ashes.
3.2. Main burner refractory frame and cast iron bar elements
In the middle part of the boiler, between the fuel box and the bottom part where the heat exchange takes
place, is located the burner, built with a special designed refractory cement frame with a slot in its central part
and a grate.
3.3. Heat exchange area and catalizator
The gases released by wood, after being passed through the cast iron bars, light producing a bluish vertical
reverse flame, which touches a special shaped chrome cast iron cylinder called "the catalyst".
The flame, passing through this cast iron element, which reaches a very high temperature, will have
completely burnt the main part of its residual carbon particles, which couldn't be burnt before.
3.4. Smoke drafting pass-through box and fan
The combustion products, after having gotten colder delivering a part of their heat charge to the water, are
collected in the smoke pass-through drafting box in the back part of the boiler. In the smoke pass-through
box is located the two speeds fan, mounted in horizontal axis configuration, which includes the electric motor
and the impeller. Any maintenance operation on the fan is easy to be carried out because the fan is fixed by
mean of wing nuts.
3.5. Air distribution subassembly
The immission duct has an internal gravitational closing door that closes the air passage when the drafting
fan stops, and another temperature commanded external closing.
The air that enters the central section is then divided in primary air and secondary air. The primary any air
stream enters the wood collecting box where, mixing with the distilled gas generates the combustible mixture
that is then fired when passes through the burner grate. The secondary air stream, instead, passes through
the two cavities located the in the burner main body and in the cast iron bars, providing by this way a further
oxygen charge directly in the flame formation area getting a complete combustion.
Key :
1 Primary air stream adjusting
2 Secondary air stream adjusting
3 Flame control bull's eye
4 Bottom door (combustion chamber)
5 Upper door (wood box)
6 Combustion air modulator
7 Anti deflagration door
8 Fan motor
9 Hot sanitar
y
water heat exchan
g
er
(
SA
versions onl
y)

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3.6. Hot sanitary water heat exchanger (SA versions only)
The heat exchanger can be equipped with an internal copper pipe coil plunged in the heating circuit water
gap around the boiler main body to produce hot sanitary water (SA models only), with the hidraulic
connections in the rear part of the boiler.
3.7. Emergency heat exchanger
The boiler comes with an emergency heat exchanger by default for the wood-fuelled section. Its function is to
let the boiler cool down in case of overheating using a thermal relief emergency valve connected to the heat
exchanger inlet (see paragraph 5.5). The emergency heat exchanger is made of a steel pipe coil with the
inlet and outlet connections located in the back part of the boiler (A5 connections). The thermal sensitive
sensor of the thermal emergency relief valve must be positioned on theA6 connection.
3.8. Water temperature sensors mounting receptacles
In the rear part of the boiler are two threaded connections (A6), both with a ½” pipe coupling having the
following function:
 to fit the copper receptacle for installing the thermostatic sensors used by the electronic control board;
 to fit another copper receptacle for other temperature sensing device (thermal emergency relief valve)
3.9. Bypass pump (anti-condensation)
With the aim to reduce the possibility of condensation products formation in the smoke passages of the wood
section of the boiler, it is mandatory installing a bypass pump. The pump must be connected between the
heating systems delivery connection (A1) and the return connection (A2), with flux direction toward the
bottom part. A circulation pump kit may be bought from ARCA which includes the pump, the pipes and the
various connections.
For the proper operation of the boiler is required the bypass pump.
THE ABSENCE OF THE BYPASS PUMP WILL VOID
THE WARRANTY
3.10. Insulation
Insulation of ASPIRO boiler is obtained using a 60 mm thickness mineral fiber layer in touch with the boiler
body, covered by the external boiler housing, made of sheet metal panels painted with epoxy powder paint.
3.11. Heating system feeding water
The heating system water chemical characteristics are very important for what concerns the general
operation of the heating system and its security. The main problem is water with a high hardness degree,
because such water causes the heat exchanging surfaces scaling. High concentrations of calcium and
magnesium carbonates (limestone), at high temperatures, precipitate and generate incrustation. The
limestone, due to its low thermal conductivity, reduce the thermal exchanging degree and this causes
localized overheating issues which weaken the boiler metal structures until the will break. We recommend to
have your heating system supplying water chemically treated in the following cases:
 high water hardness degree (bigger than 20 French degrees)
 high water content heating systems
 frequent water delivering due to water losses
 frequent water delivering due to maintenance operations carried out on the heating system.

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3.12. Pellet burner
Aspiro DUO TECH comes with a supplementary upper door where is screwed a pellet burner.
The burner operation is completely automated, and is controlled by the electronic control panel.
Key:
1 Photo cell 5 Electric sockets for connecting the boiler electronic panel
2 Secondary air stream 6 Primary air stream
3 Resistance 7 Bull's eye
4 Stainless steel grate 8 Pellet inlet
4. OPERATION MODES
ASPIRO DUO TECH boiler is a biomass boiler using wood as fuel, implementing the gasification technology
of wood with reverse flame; the boiler can also use natural wood pellets installing a pellet burner on the front
upper door with completely automated firing and cutting off operation.
4.1. Gasification technology (wood operation)
ASPIRO boiler implements the wood gasification technology. The solid fuel, charged in the upper boiler wood
collecting box, when comes in touch with the hot ember layer on the burner grate, produces combustible
gases which, when mixed with air (primary air stream) can be fired. The combustible mixture of wood gases
and the air passes down through the burner grate toward the bottom part of the combustion chamber (heat
exchanging area), where the typical
“reverse flame” will appear.
The gasification method, not burning wood directly as in any other classic arrangement but using instead the
gases released by wood under high temperature conditions, allows a complete burning of the fuel which
permits to get a high thermal yield and a very low level of harmful emissions in the flue gases released
outside.
ASPIRO boilers have been developed to limit to its maximum extension the damaging effects of the acid
condensation products. The burner chamber has 8 mm thickness walls and no welding in its upper part;
furthermore, the rear and front walls are protected by a refractory cement layer and they are not directly in
touch with water (dry walls).

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5. INSTALLATION
ASPIRO DUO TECH boilers are not different from normal solid fuel boilers; therefore, their installation won't
have to comply to special regulations different from those in force. The boiler room should be adequately
vented with opening surfaces not less than 0,5 m2. To get an easier flue duct cleaning, in front of the boiler
should be a free space not less than the boiler deep, and the boiler doors must be free to open up to 90°
without encountering obstacles.
The boiler can be installed directly on the floor because it is equipped with a self supporting frame. Anyway, if
the boiler room is too humid, we recommend to build a concrete base. When installed, the boiler should be
perfectly horizontal and stable in order to avoid vibrations and a noisy operation.
5.1. Installation in the boiler room
ASPIRO DUO TECH boilers must be installed only in rooms having the characteristics stated by the rules
and regulations in force regarding boiler installation rooms (please contact the fire department to get more
details).
The distances for the correct positioning of the boiler in the installation room are as follows:
Ke
y
:
1Wood charging box
2Gasification area
3Glowing coals area
4Cast iron burner
5Combustion chamber
6Cast iron catalyst elements
7Heat exchange surface
8Coil t
y
pe copper sanitar
y
water heat
exchanger.

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5.2. External boiler case packing
ASPIRO DUO TECH boilers come without external case: the case and the accessory kit are delivered
separately in boxes.
EXTERNAL CASE PACKING:
EXTERNAL CASEPACKING
5.3. External boiler case mounting
 Install the boiler 1in its installation room and complete the hidraulic connections.
 Roll the boiler with the mineral fiber layer 2fix it with the metal bands 3.
 Fix the anti-deflagration doors at the base of the smoke box tightening the screws 4.
 Install the fan 5in place in the smoke chamber fixing it with the wing nuts.
 Position in place the side parts 6and 7, being careful to correctly insert their upper bends in the slots
on the upper part of the front and rear boiler body plates, while inserting the lower side parts bends in
the internal side of the L shaped base frame.
 Put the upper part of the housing 8over the side parts 6and 7, carefully inserting the studs on the
side parts in the holes on the cover, then gently press down to have the studs retained by the cover
holes springs
 Fix the electronic control panel 9to the cover 8straightening the thermostat capillary tubes and
letting them pass under the external housing up to the rear part of the boiler, where they will have
their sensitive sections fitted in their receptacles located on the back of the boiler.
 Fit the back panel 10, fixing it to the side part studs 6and 7with the back panel retaining springs.
 Fit the protection panel 11 to the wood collecting box with its handle M fixed.
 Fix the hood 13 onto the middle door using the bayonet joints.
 Fix the protection panel 12 to the bottom door with its handle Pmounted.
Ke
y
:
1Packing box
2Accessories bag
3Right side
4Boiler body insulation
5Cover
6Left side
Ke
y
:
1Central front cover
2Back side
3Bottom front door cover
4Top front door cover
5Packing box

14
5.4. Heating system expansion tank
According to the regulations in force in Italy, any heating appliance with solid fuels must be equipped with
open expansion tanks.
5.5. Chimney
The flue duct is very important for what concerns a proper boiler operation; it must be completely waterproof
and adequately insulated. New or older fuel ducts not complying these prescriptions can be reused putting an
inner stainless steel duct into the existing flue duct; the gap between the two ducts must be filled with
insulating material. Flue ducts made of prefabricated concrete modules must be perfectly sealed in order to
avoid that the condensation products stain the external walls.
We strongly recommend to use a flue duct complying the regulations in force, especially regarding the
regulation EN 1806, which requires a resistance to a flue gases temperature of 1000°C. The customer is
responsible for any damage resulting from using unsuitable flue ducts.
In any case, the flue duct must feature enough drafting action, at least 2 mm water column of depression at
its base when cold. Flue ducts with not enough drafting action will make the boiler cutting off spontaneously

15
during its standby periods and condensation products buildups in the air inlet ducts. Inversely, a flue duct
with too much drafting action will cause thermal inertia related issues and poor fuel economy.
We recommend under any circumstance to use a draft adjusting device to keep a constant depression value
in the duct.
5.6. Emergency heat sink relief valve connection
Key:
A3 Boiler’s water exhaust pipe
A5 Emergency heat exchanger
A6 Probes receptacles S4
A7 Probe receptacles S5
 Connect the heat sink relief valve to one of the two A5 connections.
 Connect cold water supply to the heat sink relief valve.
 Connect the free A5 fitting (waste hot water) to an exhaust duct.
 Insert the heat relief valve temperature sensing bulb in the free A6 receptacle.
Note: the heat sink relief valve could be installed even on the waste hot water outlet, but this wouldn't add
anything from the point of view of the overall operation security level of the boiler, and debris in the heat
exchanger could plug or stick the relief valve.

16
6. ELECTRONIC CONTROL SY 400 (code PEL0100DUO)
Fig.1
Key:
1 Main switch
2 Security thermostat
3 Display keyboard
6.1. The display
Fig.2

17
6.2. Electronic board (inside the electronic control panel)

18
6.3. Sensors connection
For a proper boiler operation, we recommend to control the correct positioning of the temperature control
sensors and the security thermostat.
The control board comes with the heating system delivery temperature sensor S4 with a 3 mt length cable
(terminals 47.48 page16), the heating system return temperature sensor S5 with a 3 mt length cable
(terminals 45.46 page16) and the security thermostat (terminals 63.64 page16) wired.
They must be positioned as shown in the figure below:
6.4. Smoke temperature sensor connection
Ke
y
:
1Smoke sensor
2Flue
g
ases temperature senso
r
receptacle
The flue gases temperature sensor is wired
on the electronic board to terminals 31.32
as shown in the picture at page 16.
Must be positioned on the back of the
boiler: close to the smoke outlet is located
its mounting receptacle (pos.2).
W WA AR RN NI IN NG G! !
We recommend cleaning the flue
gases temperature sensor at least
every two months to ensure that the
correct temperature is detected.

19
6.5. Terminal strip electrical wiring
Ke
y
:
PI System pump
PR Bypass pump
PB Hot sanitary water tank / puffer circuit pump
PPS Solar panels pump
TA Termostato ambiente
MP Microswitch door
VD Deflection valve

20
NOTE:
Terminals 16 and 17 (TA) are bridged together to allow system pump operation if a room thermostat is not
employed.
WARNING:
When a room thermostat is used, remove the wire bridge and control for a correct wiring of the room
thermostat. If the system pump doesn’t work, control for a faulty room thermostat. Check that the room
thermostat have a galvanically insulated contact from the rest of the thermostat circuitry.
The door microswitch is pre-mounted on its support; the only thing that must be done is connecting the two
wires to terminals 18 and 19.
MICROSWITCH
DOOR